Sanwa Suruga grindstone Standard/三和するが砥石 標準
This whetstone is for cleaning the surface, used for the final whetting of shitaji (base-foundation) and the bottom whetting of the middle urushi coat.
Carefully whet the object dipping the whetstone in water. Wipe the mud cleanly that comes out when sharpening.
1000#, 1500#, 2000#, and 3000# are available.